> I am writing an application that needs to manipulate dates. More 
> precisely, it needs a function that, given a date and a duration (12 
> days, 2 weeks, 3 months ...) returns the date at the end of the 
> duration. Is there a library providing such a thing ?

Good old Unix.mktime could perhaps do the job.  It has the ability to
correct for impossible dates, e.g. change Sept 32nd into Oct 2nd,
or 2003-13-01 into 2004-01-01.

So, perhaps you could just increment the tm_mday, tm_mon or tm_year of
a "tm" record by the specified amount, then call Unix.mktime and
discard the first result to get a normalized, but equivalent date.

- Xavier Leroy

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